#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define chmin(x,y) x = min((x),(y))
#define chmax(x,y) x = max((x),(y))
#define popcount(x) __builtin_popcount(x)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
const int INF = 1e9 + 100;
const long long LINF = 1e17;
//const int MOD = 1000000007;
const int MOD = 998244353;
const double PI = 3.14159265358979323846;

int main(){
    string s;
    cin >> s;
    string ans = "";
    ans.push_back(s[0]);
    for(int i=1;i<(int)s.size();i++){
        if(s[i] != ans.back()) ans.push_back(s[i]);
    }
    cout << ans << endl;
    return 0;
}